<html>
  <head>
    <title></title>
    <style>
    
      div { 
        background:gold; 
        width:50%; 
        margin:*;
        height:width(75%); /* width/height = 4:3 */
        
      }
    
    </style>
    <script type="text/tiscript"></script>
  </head>
<body>
  <p>div below has fixed width/height ratio as <code>height:width(75%);</code></p>
  <div #test>4:3</div>
</body>
</html>
